Majlesi Journal of Electrical Engineering http://mjee.iaumajlesi.ac.ir/index/index.php/ee <p>The scope of MJEE is ranging from mathematical foundation to practical engineering design in all areas of electrical engineering. The editorial board is international and original unpublished papers are welcome. The journal is devoted primarily to research papers, but very high quality survey and tutorial papers are also published. There is no publication charges for authors.</p> en-US ashourian@gmail.com (Dr. Mohsen Ashourian) mjee@iaumajlesi.ac.ir (Support Contact) Sun, 16 Jun 2019 16:25:36 +0000 OJS 3.1.0.1 http://blogs.law.harvard.edu/tech/rss 60 Low Size All Optical XOR and NOT Logic Gates Based on Two-Dimensional Photonic Crystals http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2703 <p class="MJEE-Abstract">This paper presents a square lattice of two-dimensional photonic crystal in the design of NOT and XOR logic gates. An important characteristic of this method is that the one structure allows implementation of two types of logic gate. The structure consists of two inputs and one output so that whenever it is used as a NOT gate, one of the entrances acts as controller for the input. Plane Wave Expansion (PWE) is used to calculate frequency band structure of the proposed lattice and the Finite Difference Time Domain (FDTD) method is used to calculate the optical power distribution in waveguide paths. The low size and simplicity of the proposed structure are its advantages that makes it suitable for use in optical integrated circuits. Also the optical power transmitted to the output in "0" logic state is very close to zero.</p> Fariborz Parandin, M. Mehdi Karkhanehchi ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2703 Thu, 31 May 2018 15:47:02 +0000 Wind energy storage system by SOC balancing control for a stand-alone windmill http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2741 <p>Fluctuating nature of wind is not suitable for stand-alone operation, so this unstable wind has to make stable. To make stable wind source boost converter with controller, bidirectional converter with controller and energy storage devices are mandatory. During boost operation the parameter voltage only boosted in the output side and power is constant, so maintaining constant power is required. To maintain this constant power wind speed consideration is important one. This concept is applicable for both boost DC-DC Converter and Bidirectional DC-DC Converter (BDC). Estimation of Battery State of Charge (SOC) is an important task to maintain effective operation as well as protect battery from ageing. Charging and discharging is a cyclic process of battery but effective process is required. Several methods are using to battery estimate battery SOC, but coulomb counting method is an effective method for battery charging-discharging operations. This paper proposes consideration of battery SOC and wind speed for effective wind harnessing operation of wind. The proposed system is design from MATLAB/Simulink and validates the system in Hardware prototype model in order to SOC Balancing control.</p> Vijay Rakada Attuluri, Suresh K, Srinivasa Rao G ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2741 Sat, 02 Jun 2018 03:48:51 +0000 Power Reduction of the Low Offset Dynamic Comparator with Novel Techniques http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2801 <p class="MJEE-Abstract">In this paper, dynamic comparators structure employing two methods for power consumption reduction with applications in low-power high-speed analog-to-digital converters have been presented. The proposed comparators have low consumption thanks to power reduction methods. They have the ability for offset adjustment. The comparators consume 14.3 and 24 μW at 100 MHz which is equal to 3.7 and 11.8 fJ. The comparators have been designed and simulated in 180 nm CMOS. Layouts occupy 210 and 240 μm<sup>2</sup>, respectively.</p> Mousa Yousefi, Khalil Monfaredi ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2801 Mon, 09 Jul 2018 02:59:01 +0000 Design of UPFC-PSS Using Firefly Algorithm for Stability Improvement of Multi Machine System under Contingency http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2958 <p>The multi machine power system with the interconnection of number of generators and loads is having the dynamic stability as the important factor to maintain the step with respect to the generators connected to it. &nbsp;The stability of individual machine and also the stability of a generator with the other generators is having more importance. The supply of the Damping torque required for getting the desired condition of stability enhancement is done by the power system stabilizer. &nbsp;In this paper a new method is proposed for stability enhancement of a three machine nine bus system by using the coordinated application of the unified power flow controller and the power system stabilizer designed by using the Firefly algorithm. &nbsp;The improved stability performance of the tested multi machine system was compared with Genetic search Algorithm approach without and with the application of the unified power flow controller. From the pseudo spectrum analysis it is observed that the better improvement of the stability of the multi machine system is achieved by using the proposed method. From the step responses it is evident that the relative variations of inter machine states with unified power flow controller and firefly based power system stabilizer are settled at faster rate. The contingency analysis is done to consider the non linearity problem. The responses of the system with Unified power flow controller and Firefly based power system stabilizer are settled at faster rate for the normal case and also for the contingency cases.</p> Ravindrababu M, G Saraswathi, Sudha KR ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2958 Sat, 22 Dec 2018 15:05:40 +0000 A New Design of a Compact Metamaterial Antenna for RFID Handheld Applications http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2967 <p>The development of miniature antennas is the key requirements for radio frequency identification applications in various fields.&nbsp; A new design of a compact metamaterial microstrip antenna based CSRR resonators is proposed. The proposed metamaterial antenna has a simple structure, it is formed by a rectangular patch embedded a T shaped slot in one side and a two metamaterial unit cells formed by CSRR etched from the ground plane in the other side. The designed antenna is printed on an epoxy Frame Resistant 4 substrate by using CST Microwave Studio. It operates at two RFID bands around 5.8GHz and 2.45GHz. The designed antenna was fabricated using an LPKF machine and the simulated results were validated by measurements.</p> Ennajih Abdelhadi, Nasiri Badr, Zbitou Jamal, Errkik Ahmed, Latrach Mohamed ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2967 Fri, 28 Dec 2018 07:04:29 +0000 Sharp Roll-Off Ultra Wide Stopband Compact Microstrip Lowpass Filter Using Square-Shaped Resonator http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2876 <p>In this paper, a novel compact microstrip lowpass filter (LPF) with sharp roll-off and ultra wide stopband with high suppression level is presented. In the proposed filter, square-shaped resonators were used. The cut off frequency at 3dB was 1.88GHz. The maximum insertion loss of this filter was less than 0.1dB and the return loss was also less than 16dB in the passband. In the proposed structure, the stopband extends from 2.07 to 29.5 GHz at 24dB level of suppression and was considered as an ultra-wide stopband. There was a significant relationship between simulation and fabrication results.</p> Behnam Afzali, Farshid Yousefi Moghadam, Farshad Nadi, Rohallah Zallbeygi ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2876 Sun, 13 Jan 2019 07:53:06 +0000 Comparative Analysis of 12/16 Conventional and Proposed C-core Radial Flux SRM Topologies for In-wheel Electric Vehicle Application http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2933 <p>In, in-wheel Electrical Vehicle (EV) application Axial Flux Switched Reluctance Motor (AFSRM) is more suitable than Radial Flux Switched Reluctance Motor (RFSRM) due to higher outer diameter to axial length ratio with, lower flux length and higher flux density. Switched Reluctance Motor (SRM) attract more attention due to its Permanent Magnet (PM) free structure. In view of this, C-core RFSRM is proposed. It is offered combined merits of radial as well axial flux SRM. In this paper C-core RFSRM is compared with conventional RFSRM based on 12/16 pole three phase structure. Average torque and phase inductance are calculated with mathematical modeling. Computer Added Design (CAD) is verified with 2D and 3D Finite Element (FE) analysis. It is observed based on simulation result that, C-core RFSRM is offered higher torque than conventional RFSRM with removable wheel/rotor facility without disturbing stator. Prototype hardware is designed for the proposed C-core RFSRM and check the feasibility for in-wheel application.</p> Nikunj Ramanbhai Patel, Varsha Ajit Shah, Makarand M Lokhande ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2933 Tue, 22 Jan 2019 07:43:37 +0000 Emotion extraction from video fragments using gaze tracking and AdaBoost classifier http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/3039 <p class="MJEE-Abstract">The communication with the world around us is an important issue, one type of which is communication between the human and computer. If the computer senses the person's emotion, it will be easier to establish this connection. So extraction of emotions is a significant topic in communication between the computer and person. To extract an emotion which is absolutely undeniable, various biological signals can be used. One of the easiest methods to record these signals with high precision, is to use eye tracking and the concentration on the screen.</p> <p class="MJEE-Abstract">In this paper, the eye tracking is used to extract emotions for the communication between the human and computer. According to the gathered data from the persons and videos, some of the characteristics of signals such as focus areas, pupil diameter, statistical features and features of videos are extracted. In order to improve the results, combining the features is also proposed here. Then, based on two distinct outputs i.e. Arousal and Valence, and employing a linear combination and reducing the dimension, some features are selected separately. Finally, to classify the two axes associated with the Arousal and Valence in the range of 0 to 9 which is divided into three equal parts, special types of KNN and SVM methods eventually combined with AdaBoost classifier are used. The numerical studies show that the extraction accuracy (on the average) is 68.66% for Arousal axis and 74.66% for Valence axis. As a result, the overall accuracy is improved 5.5% compared with the previous works.</p> Atiyeh Yaghoubiy ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/3039 Sun, 27 Jan 2019 11:50:55 +0000 Novel Load Following Controller of Microturbine Generation System for Stand-alone/Grid-connected Operation http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2954 <p class="MJEE-Abstract">Among various types of Distributed Generations (DGs), microturbine (MT) generation (MTG) systems are known as highly reliable and efficient sources. The MT must support demands in different conditions, which requires its proper control. In this paper, hybrid operation of the MTG is considered which is initially isolated from utility grid, and after that it is connected to the distribution network.</p> <p class="MJEE-Abstract">A robust control method is used for stand-alone mode and a novel power-voltage control strategy is applied to grid-tied inverter. In stand-alone mode, the voltage, frequency and current are used as control parameters instead of traditional voltage-frequency control. In grid-connected novel controller, the inner voltage loop is substituted with the current loop, so it is based on powers and voltage. The simulations are performed by MATLAB/Simulink, with the results indicating proper power sharing as well as load-following performance with the minimum level of distortion. The proposed strategy can be used in hybrid operations of the MTG.</p> Pouyan Asgharian, Reza Noroozian ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2954 Sat, 02 Feb 2019 13:53:00 +0000 Impact of Optimal DG Placement and Sizing on Power Reliability and Voltage Profile of Radial Distribution Networks http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2782 <p>Nowadays, energy supplied by the reliable manner is one of the important challenges of the distribution company in the radial distribution system. Therefore, this paper considers these challenges by the optimal DG placement to minimize power losses with considering the analysis related to the reliability and voltage profile. In this paper, exchange market algorithm (EMA) as a powerful tool is used to solve the optimization problem. In order to extract the global optimum point, EMA uses two searching operators and two absorbent operators based on the generation of random numbers. To evaluate the goals of this paper, EMA is successfully implemented on 10, 33, and 69 bus IEEE test systems. Simulation results illustrated that power losses are reduced by the optimal DG placement and sizing. Finally, obtained results analysis concluded that system reliability and voltage profile will be improved if the DGs are allocated optimally in the radial network.</p> Mohammadreza Daneshvar, Mehdi Abapour, Behnam Mohammadi-ivatloo ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2782 Sat, 02 Feb 2019 13:56:40 +0000 Computing Outage Probability for a Mixed FSO-RF System with Energy Harvesting in Downlink Transformation http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/3121 <p>A new emerging solution to prolong the lifetime of the energy-constrained wireless networks is energy harvesting. In this paper an amplify-and-forward (AF) relaying network in downlink phase is proposed. The relay harvest energy through free space optical (FSO) link from the source and uses it to forward information to the destination through the RF link. Also there is a direct RF link between the source and destination. The FSO link experiences Gamma-Gamma atmospheric turbulence conditions with pointing errors and Rayleigh fading is considered for RF channels. For this system a closed-form expression for outage probability in the form of Meijer’s-G function is derived.</p> Ali Asgari-Forooshani, Masoudreza Aghabozorgi ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/3121 Sat, 16 Feb 2019 14:03:17 +0000 Finite Set Model Predictive Control of PWM AC/DC Converter With Virtual-Flux Estimation Under Grid imbalance http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2853 <p>The aim of this paper is to improve the quality of input current for AC/DC PWM converter in case of grid imbalance with high dynamic transient. This can be achieved by joining compensating power with finite set model predictive control (FSMPC) <strong> based on voltage sensor-less technique</strong>. The control scheme proposed in this paper is divided into two steps. First, a double second order generalized integrator is used to estimate the virtual-flux and separate sequences of grid current and then the compensating power necessary to obtain sinusoidal input current is calculated. In The second step the current are regulated via FSMPC where the switching state is determined directly. Matlab –simulink is selected to simulate and verify the effectiveness of the proposed control scheme with and without virtual flux estimation and the results are compared to confirm the validity of the algorithm.</p> Merzouk Imad ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/2853 Thu, 17 Jan 2019 00:00:00 +0000 Feasibility Study on Design and Development of a Hybrid Controller for Ultra-Precision Single-Point Diamond Turning http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/3280 <p>The recent realm and the leader technology in advanced manufacturing of critical components, and optical surfaces is ultra-precision single-point diamond turning (SPDT). This state-of-the-art technology enables machining optical surfaces with nanometric accuracies and surface roughness from the order of nanometers. However, there are drawbacks in this process and SPDT is limited when machining brittle and difficult-to-cut materials. Non-conventional assisted technologies have been developed and been used to assist SPDT for extending turning limitations. Recently, application of novel hybrid platforms for SPDT has been emerging to achieve the best possible outcome in optical surface generation. Hybrid controllers are playing the main role in a hybrid platform. Main tasks of a hybrid controller in a hybrid SPDT platform include real-time assisted technologies performance control, setting working parameters, and effective communication with implemented sensors for on-machine metrology. Hybrid processes in SPDT are recently emerging and there have been a few studies on designing and developing such novel platforms for SPDT. The purpose of this study is to design and simulate a Multi-Axis Automatic Hybrid Controller (MAAHC) to be used in a hybrid platform for assisting SPDT technologies. MAAHC has three process cores which work independently and communicate simultaneously. The designed MAAHC has different capabilities; MAAHC can control and drive ultrasonic vibration system, laser beam system, and on-machine metrology systems i.e. optical vibration sensors. In addition, MAAHC is able to control and drive two stepper motors in two independent linear axes. Electronic switches, communication ports, and high-performance switching have provided a full control on secondary technologies assisting in realizing a hybrid SPDT platform. Theoretical equations, design specifications, and simulation results have revealed the proposed MAAHC is functional and has met all requirements to control such a hybrid SPDT process.</p> Shahrokh Hatefi, Khaled Abou-El-Hossein ##submission.copyrightStatement## http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/3280 Tue, 18 Jun 2019 14:13:04 +0000